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As a cell grows, both its surface area and its volume grow. The surface area is important, as it limits the quantities of oxygen and nutrients the cell can take in, as well as the rate at which it can get rid of waste chemicals. The volume is important, as it contains the organelles that need the chemicals entering the cell and produce the wastes that have to be removed. As the volume increases, more organelles are formed.
With growth in size, the volume grows faster than the surface area. (The volume is measured in cubic units, such as cubic micrometers, whereas the area is measured in square units, so if a cell doubles its width (multiplies it by 2), the volume enlarges by the cube of 2, namely 8, while the surface area increases by only the square of 2, which is 4.) This means that there comes a point at which a cell cannot grow any bigger and still have enough area of surface membrane to supply all its organelles. The organelles in the center of the cell will not receive the necessary chemicals and be able to dispose of their waste products.
To put it more technically, the surface area : volume ratio decreases with increase in cell size, and eventually becomes limiting.
Mature plant cells can grow larger than most animal cells, because the interior of the cell is taken up not by cytoplasm but by a vacuole containing simply water with various chemicals in it. The vacuole contains no organelles.
The rule about surface area : volume ratio applies to any objects of different size, but of identical shape. Any object that become flatter increases the ratio of surface area to volume.
Another advantage of having many small cells is differentiation. The cells become specialized for different functions.
and also large cells won`t fitt in our body if they have large we become fatty people and go into gym and also there will beauties left in human beings
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Describe how natural selection might have caused differential reproduction among the ancestors of a fast swimming predatory fish such as the barracuda?
Natural selection is when biological organisms with favorable traits survive and reproduce more successfully than organisms that do not possess such traits. Organisms with negative or less useful traits survive and reproduce less successfully than organisms lacking such harmful traits. Natural selection played a huge part in the evolution of the great barracuda. The barracuda had to adapt their distinctive shape, design, and skills over the years and did so through many generations.
What are three types of extreme environments can archaebacteria survive?
Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions. Archaebacteria are characterised by absence of peptidoglycan in their cell walls. Instead cell wall contains protein and non cellulosic polysaccharide.
Is a crow herbivore?
no, because they eat seeds and stuff like that. So that means they are omnivores.
What process did Darwin's book suggest that organisms evolve through?
These three ideas seem to run together, so it's important that you are able to distinguish among them. The theory that organisms change over time is evolution. The mechanism by which organisms evolve is natural selection. Survival of the fittest explains how natural selection works.Answer = Natural SelectionThe process of natural selection, of course.
What is fitness in terms of evolution?
In biological terms, fitness is the suitability of an individual, or of a species, for its environment: the better-adapted it is, the more likely it is to survive, and to thrive. In other words, it fits.fitness: the ability of an organism to survive and reproduce in its environment.
Why are villi so small?
Villi are so small because they are only made of one cell- they are single celled organisms
Are amoebas large or small organisms?
They are microorganisms, consisting of only one cell, and they are so small that they cannot be seen with the unaided eye. Some organisms are smaller than amoebas, but they are still very small.
Why cell can be an organism?
Just Because it's so small does not mean it isn't an organism. == Answer== Some organisms are unicellular, meaning that are composed of only one cell. Life started as unicellular organisms which turned more complex later.
How does adaptations help organisms survive?
Organisms adapt to their new environments to survive and meet the 2 goals of all animal life: Survive and Reproduce So that it is better suited to the enviorment and knows how, and has what it needs to survive.
Why are single celled organism so small?
There is a limit to how big a cell can get, and that nearly always means we need a microscope to see them, Size is limited by the need for substances to diffuse in and out of the cell. If it gets too big there simply isn't enough surface to allow enough exchange of substances for the cell to maintain its life processes.
What are multicellular eukaryotic autotrophs?
A heterotroph is an organism that requires other organism to survive. Multicellular organisms have more than one cell. So being multicellular and heterotroph means that the organism is multicelled and depends on other organisms to survive.
Why unicellular organisms do not have specific organs?
Unicellular organisms are composed of only one cell and thus do not have the need for specialized organs like complex multicellular organisms. Instead, they carry out all necessary functions within a single cell, such as obtaining nutrients, metabolizing, reproducing, and responding to the environment using simple structures like organelles. This efficiency allows unicellular organisms to survive and thrive in diverse environments.
Which is these organisms has the most complex cell wall?
Plants and fungi have cell walls. Note that while plants have cell walls made of cellulose, fungi cell walls are made of chitin.
Why do organisms in ecosystem engage in relationship?
organisms in an ecosystem engage in relationships because they need partners or pairs so they can survive in the ecosystem
Why is in important for an animal to have an egg cell?
So it can reproduce and its species can survive...
How are paramecium and plant cells similar?
Paramecia cells are organism and can survive on their own. Sheep cells are not organisms- just cells and can't survive on their own. They are made up of the same things like a nucleus and ribosomes, ETC.
How is camouflage an adaptation?
Camouflage is an adaptation because it helps the organisms to survive without being prey to other animals or organisms. Adaptations help an animal to survive so having camouflage helps the animal not to be eaten!
